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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'fa8b5348c77005c7c3ca252c20cdc80c6f82326db217043763ffedfcf28e4362' 
  AND token = 'bBw0VyR72osu73FsI1/U3rgxb3ntfq1WQKH6F7khEXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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