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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '0e213d77f1c4eb3226d9b05008fa8663eda7ede8f53a129a5c578d3208f70239' 
  AND token = 'OqsWIE5HzLPhL0sA5G8FBEZPfC8DVWSs6R09VC1gvRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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