Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b514f3ea6b12bb9f8f3cfb9f0b0bd191361b69f18efafaf1c00d41338c599d6a' 
  AND token = '7X5LmsNoeyoiwyiiO4zzdb4apd9MBOq7x3VabDoHjOo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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