Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f3cfb34dfb24916df2c7cb0e681ab7ca579745bbc0be529704e35190582558a' 
  AND token = 'RTkLuoDCoViBIylIwGtTQdV5HTQkUp6FLESnhwlU3DU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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