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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'fb59da846f3675487621f2da3f9f7fdf30c6fe4db07ac89c953128c00d96c728' 
  AND token = 'mEZ0Q7L8UWA5HMNut1RvL6/NlZoxaKs4bteBUPsgX/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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