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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'bb69555fb486c2123de67e00c9bcc55c37f0c29efc682708516110d60eeeb57e' 
  AND token = 'lz5O8mfN7t/lfl0NdD1geFNWb30pjofAZOd3EqChsDc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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