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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ee1326a92b33f86eafe3d764d32d50fd7979778727bb439e9b6b83d838adc520' 
  AND token = 'BDgVWykZBDPymgeBnhbGSYDKO5IFnPihFhBhbzYriEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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