Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c42c21f96654573b58f590586a0900b33fa863fab8e964d233f91f60aca57aeb' 
  AND token = 'S+Ep7Y5ueOV0LASABWod7rraMimPaGlpa/rog1QCUyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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