Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0edf6f362ca4dabfbaa9fb065eb04938179ebf82830c6b0bb8a93ec2c08524d' 
  AND token = 'heC5eOw9F+eDmbDmoe7xsY2RNh0zlO3U4WW6FM8Vmzw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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