Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f9b0882304eb6fcc46b1c68147b0278aacb9ded318e447d279bab74ec2ef417' 
  AND token = 'C5NTrM3/K/ooWgCQqPvKvryN34xQ4ddYxYgmc0Riq6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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