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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '290fcb7b5beaba2bcc5a9f3b85dbaee220ce87eb5cb3c9e907d3629dc2c2afbd' 
  AND token = 'qJXSfGxWITKV7rcE6Etybo5vFQlR8QRxLqFvAh45BZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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