Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66ec3610686855c737280e57c863f5b0d2e9f1ba19fe3b7d8ad691755f21596e' 
  AND token = 'ESkCz2OvSOhCanAcedHjOIzQXH4lZZO2MvS4+pe+/6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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