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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '44219d0f81cf2481829278173c80fd5496fcf6cc68cdb210d2794614b0a3f3d3' 
  AND token = '+DCaccpXgzkYwaT7CXgl8L+kBTscBqtxRSrO1Z88RLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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