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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '7ac3bae423dcab00ff26a94e2d1e68f98569635db2a6ce2a372705bef63cda7e' 
  AND token = 'qcvxZvJ9pNe6H3AYDzlnsiKBDyiAaNjTTu2rUxeTLoc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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