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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '902fbe60daec419df232d0c69b73c68edf69f1ec1ff7c6bf526a2b1053404bf3' 
  AND token = 'zSLwHvkpoC2U3WmnsFSDJAGXdTdLWFzIy5k4NES0Wsg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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