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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '01eed25d2a48dbaa00ce03b6d59edc875bbdfd0f7f9b203d81d55ad166af0176' 
  AND token = 'EQTV60zfNyFtSsZFIWVdsNAO80Yr2osMebyfY5La3a8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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