Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81dd455cf57e30cbc008280617a58e24cdeff050a63a80463cdf4dbb0f5da97d' 
  AND token = 'NojLfXWk+1SrfXS0dIxOPKr6JqNH0oA9XVilH+wyj88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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