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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '4be5da5e122fada34d1807cc6e903ae6e04b0a6bcdc25eb87f83844a58052180' 
  AND token = 'Oxd0uiFES+LJJV45zGm69yXrdHT5VLEzAVk040Iaw24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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