Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab3662ed9bb34b14f8f95f145cfe34da85e15d4a09fcf5776dae6a2863e3ac94' 
  AND token = '6OA+dWDa54/OtCr4MFGW8s0rX4HExKqE6b+gZkmNKMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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