Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2cb4a9ce763f0561599abb07b9b95250ad0c681059e4640d5e5bad34e1f2c44' 
  AND token = 'wMTvIl87gYkKgLfdlL9wbxYyn9NF+qzRgxOEQFM9MA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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