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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '9e1f383e2956e95555438c999ce40a9263fb57d878c15c0e7426a7f0cf39d2f0' 
  AND token = 'Phhz7Iy3IE4HMmXRTgjtXq5WfWt7hHLPYymnZCOzPlI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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