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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '9d46d7147e643046dd341f8e362a20911d53a4c17f324e46a07bad123b48f9a8' 
  AND token = 'm8SJrt6qmZsFs9AJ+DfSiyJ5n2ruv4f7ogyyYcgF7Xw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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