Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c94e552aee0cbd4764baa3b24819d139768615f28b7813ce53860a7ca776cdb3' 
  AND token = 'nE3yW/deuDc7wgsxaTVFHh+etIIE4tmo10MRISwMTIc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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