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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '55c89a364d317ceed6c809dffe345adce2dc38907a8888862e1aa30e8e1fd792' 
  AND token = '02QSUslepQb6s2+tSgfcq0LJBg575r9y6Sk3pb2Y+R4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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