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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '1f559379125b284a60ebc5239e708f7ffe41ec89aa08063d63c539a7d92a3612' 
  AND token = 'ZbbmmqUdnmTO1nnWghuO1NwnApzh3UcAje1RpDSaxTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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