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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '1eb77a7e202896597f7fd71478746f954b300e22ace2ba2db2bd936da1116bb0' 
  AND token = '7fRna25kIGSwexsow2jDUW31nT4auix51tAjfwbMXB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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