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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '947492dd280da72696bbd7394005a88c6dab2d946ee27147e79c89f81eb4e1bd' 
  AND token = 'NfBpA5xwT6z3nSB4vyQmR+q/UNpHieyE/+AC1sGyngE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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