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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '69d139cb5d35d7a13e4b51547f653cdb5ad0c642487e4f4c81a2f2c050e9f361' 
  AND token = 'euiB89+70aLU/+519qKCNAIeMK6hW8vKrTaoe1OR1gY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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