Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b52d5665ffc91b4f1f6017decc7eec2be383c502e8a11577ade49c7cc112d43' 
  AND token = 'Vtc924qnThk6GkoKEOQwRSQf3gz9nzz0WSsM+myiMX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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