Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af0f0a083b14f2434fd2e4c2fb468dde162fc31a31c76b2aa91dbe10f4f15513' 
  AND token = 'P+/NiCUOsKShilQBvoDTwJ1ucf62+q3D3FMZDWiojw0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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