Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45d81e78fbdebc91b6ba44003a05e7f21f6d20b5cdb1928c84a60fff1593af66' 
  AND token = 'kuemM5s/9LFyu4o1m6dr5+d39wXIoBQ6gnL2Kmo2KYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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