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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '6fe185fcac9ce4d902cd4ee4ad0805f7b80f4be27f7af876f10c3717791d55b7' 
  AND token = 'jdcfbzayFTv5qQZi4QS41xHTiO2CBd3vT3erepWhpZ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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