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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a45c73f1a6ed4b49078e704eb25a5f7cc1ab861a4daa02e94db08c54c2ef5358' 
  AND token = 'ktK7JWGT8sus6XenmJZxFjyfkWrqj2W/aJ6vNJ6bcy0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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