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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '034983667a57a0342bc7fadfbb83a5fd9b16cb555fa53f3886681e578858271e' 
  AND token = 'EuUJyT8eXkTCZZbnQqFIAk8ogFMKIfyEU7OSnWmOcVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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