Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd85d4c83b7a0e5d8d74f1436a1548c13b93461dd7210ab519e4c2cb068f7b185' 
  AND token = 'PeOAyCuuMCWaZ1i5krM0wGG+AachhjkdNPd18L+9N34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}