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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '8b5c837a8d2352b6c3cc3a5c1396b2a089b757434e60ce9b2af96849fc98d3aa' 
  AND token = 'ou1hiTUjSZyKm1yoKgRP22CctZ4fYDq8oJB38ply4dM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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