Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e027036a2a0eed50f40c2f50d309a70f6ceb325ca40dca7ccabd9992a1062e9' 
  AND token = 'ClHFAxZKK/KstxRIG5K65FyKmH+AD/8p8vp1DkthloQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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