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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '1100a02de92c7d98e8b1b09fc055e6749e8dbde349e1a407efb2c3b19d003b34' 
  AND token = 'oP+rnArLXt8cicFG+9wUxMioPVPJO7RL/tq/ikFrxU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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