Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a51fb2bf9b8cc25f434e04eecdf0f512e697eb10207808b570da2f19cc9cff31' 
  AND token = 'gqThw3logojzGbS8yxO1H258ZIGslL2gcTKHRhVHNFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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