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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ced83644fd18283eb638f99307699e11a4673b418e4a81c66d189ff9ae6e68eb' 
  AND token = 'Yux7GwSwS2Gj2pV8h7fXA6opjZjhSQJPHh3WyjFTMnE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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