Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c5f4b86f814256342b42b0ff8cd02b8dc0cdf5330167f73433e77dde439f598' 
  AND token = 'M3Phyk6B9blRNMd0mVJdV2KCnuPlUrmv2sZcb1ccqqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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