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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '487fc61d94e283eb2bf64626dc9c50814aedbd3abc2079ae7a7f1fd7dbeb5302' 
  AND token = '56niNX/lfHMwb9ul5UNzWoiVy8X2IGzdFkhkcA7nsiE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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