Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3ba22935fccfaebc2a66d268b4dcda4df2db1a4c8877eb349a1e2bd7fa2e5b6' 
  AND token = 'JNZYk1PQErm9gsguSeTN3VjpdQiktlvtjZ5cndF6D34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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