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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ba381476287a8ef53e27583dbf731d73b9f2b611b9a30271cdd2949bf66a64b7' 
  AND token = 'fb781LaT5bbqs3quCjgBp8q6cy65eFzWZUagr2N29Hw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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