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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e0aebe5e6d9ccb7c4f5f68ff1740c05508a77bb2fb6aeae7dda0ba41e65d6222' 
  AND token = 'yCbeSfUyrYBPCnJ1/QjSdYpievbvMR5E4QYUOcvqUVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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