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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '92ecda21cbe997f844bc088bf9f9acc3356d2c7f3cfa7107e6a1abbd1cf96272' 
  AND token = '44xwrKvy1uLM4bx7STTDCvK41JhcypMg7tKkqmtQOvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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