Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd128f3e83878ddccefe797e2e603ee4923fd4cf16bc80fdefbbe76a760a31b10' 
  AND token = 'nBf7ra1XEAwMivatfQMcgd5/ELFsDKIbQ608grormjk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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