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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'bf07b6e837915f3664ecc43fadbb8843fc46b7542ed3cda1c7de0606af9aeef5' 
  AND token = 'sKVvXPbwKdolZXN5y+gWOe82cAeM51cO2WvMzl8JTS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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