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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '79ec6fcaa54ce5a1393ef6edd5cf04e2f57c2facd05bd4864c527e205eb50744' 
  AND token = 'y7KmFu8eRMD3bsr2pP8gy90MLcLCVvDOiU1fov8WivA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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