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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'c9d1ae50b47f80145fc8e6554efed50d4c6579ed072e937ded29489bbcc30eea' 
  AND token = 'vAXeo+SBzmlIByYwKIZnOKcPhXruWwkqDe2Ue3dnnQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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