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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ac4e95a00f4a491b43b2689d14be5f3cfbf1ce56d81ea1ded34ac7dc5003ee2a' 
  AND token = 'LUvaB2Qjvok6Y7J5TyT4MIglQ8pWhHnNkZ9yvH4FNUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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