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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'fefb6e9cf93f714c89064c8a46d3f9c1f784dc989a43513d65a1c6134c6a2da8' 
  AND token = 'jBHEAy6Ygi+Ko3JlTZRjtyDS5d2HtxF2O1oLbYazgjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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