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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '9c8ddb529ae6d7e639e8337f6794274c4979ffdca2ee93802b0d8b2b7828cdbf' 
  AND token = 'RJQEeZYUnC2kBZ2k1dl9JfTiXkl6F5SnnhcMQtCKbxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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