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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'f1d93302442065da6fe992e325c971c934c5afb5d5a5193f1a75b504c6e6b268' 
  AND token = 'T+SM0nuwYxh14yiMKgyAD5sDflq66B6o4K1GwS5hzWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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