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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '44f2b2eefd7b9c87712e1a4a71ca83b541ef6242eb794140090f59d207ae8e6a' 
  AND token = 'iXA/LAK7krwcWVbDIfiotYkEumnFyqohDWfj2+DcLKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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