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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e29c8c0d41d9ded5b0aaed71804817c95e9f3e7e51015789b9ee389cc4db8d3b' 
  AND token = 'kt/t9XiCumWkJlEQN2CaXGU8Yovvc5b/DprJ7Q5t3uA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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