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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'f3e117f3db14cf1208e06dabb63810d762919fbac6e37cc49d6e9885ceb4157e' 
  AND token = 'LQVMJoog1f0JMLPCFILmy5qYMNoUfyAjPwJyPgH1VCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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