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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '859f9edca970ba1865f4cfadb7cd93aafc9ecf6edabb01150f020dc0b175e2bc' 
  AND token = 'ROqf+t3EkJ2ir5Y/S3itF9HhgBano+5j9RjhrM2z8qo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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