Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ad5f420ab4a7beef3c2a2530f9c15d5fbd21f9ce4a301071c579af436e19524' 
  AND token = '+D4xbXNv3GAzw0Hy8y3/kyRlgTV9fzOXqNDorHYMuFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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