Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c55a464b933bcfad82007b20f283117774ce9fb87c5eea7325e4ebe83bd243da' 
  AND token = 'oltcKk+MVqS8WaVUvU8C2KD1r8PMgKIujATnLJ9DeQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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