Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8e185b0d8fe0d75fb283dea19112a2bbf6d46714c97b5132749d4c9c687996d' 
  AND token = 'qs7Bh8yDSQ5CGSpUF9vI4ga4Tfqm+QHyhhT0Na8tHoQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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