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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'fd2ca5bf870b6ce877471856d403670e2fbd7006b642fc74a4447cf85994be39' 
  AND token = 'OAGJI0r8i4ia8h4cWb2q5Ogj9bvWkTD1KX9wJ8Bd8Gw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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